import java.util.Scanner;
public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);

        int a = sc.nextInt();
        int b = sc.nextInt();
        int n = sc.nextInt();
        double c = a*1.0 / b;

        for(int i =0;i < n;i++){
            c *= 10;
        }
        c = (int)c;
        System.out.println((int)c%10);
    }
}